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Some body spray advertisers claim that their products contain human sexual pheromones which act as an aphrodisiac. In the 1970s, "copulins" were patented as products which release human pheromones, based on research on rhesus monkeys.[6] Subsequently, androstenone, axillary sweat, and "vomodors" have been claimed to act as human pheromones.[7] Despite these claims, no pheromonal substance has ever been demonstrated to directly influence human behavior in a peer reviewed study.[6][7][8]

Few well-controlled scientific studies have ever been published suggesting the possibility of pheromones in humans. Using a brain imaging technique, Swedish researchers have shown that when homosexual and heterosexual males are presented with two odors that may be involved in sexual arousal their brains tend to respond differently, and that the homosexual men tend to respond in the same way as heterosexual women, though it could not be determined whether this was cause or effect.[citation needed] The study was expanded to include homosexual women; the results were consistent with previous findings meaning that homosexual women were not as responsive to male identified odors, while their response to female cues was similar to that of heterosexual males.[9] According to the researchers, this research suggests a possible role for human pheromones in the biological basis of sexual orientation.[10] In 2008, it was found using functional magnetic resonance imaging that the right orbitofrontal cortex, right fusiform cortex, and right hypothalamus respond to airborne natural human sexual sweat.[11]

In both of the documents, the possibility was canvassed that a strong aphrodisiac could be dropped on enemy troops, ideally one which would also cause "homosexual behavior". The documents described the aphrodisiac weapon as "distasteful but completely non-lethal".[2]

Body odor remote-engineering, such as halitosis and hyperhidrosis, was another possibility discussed. Again, these effects would be produced by a non-lethal chemical weapon—possibly one that would affect the hormonal and digestive systems. It appears that a 'heavy sweating bomb', 'flatulence bomb' and 'halitosis bomb' were also considered by a committee at the time. The plan was to make an enemy so smelly they could be quite literally sniffed out of hiding by their opponents. It was also considered damaging to the enemy's morale.[citation needed]

Wright Laboratory won the 2007 Ig Nobel Peace Prize for "instigating research & development on a chemical weapon—the so-called 'gay bomb'/'poof bomb'—that will make enemy soldiers become sexually irresistible to each other."[12]